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Dogfish likewise have two dorsal fins, each with smooth spines, but no anal fin, and their skin is generally rough to the touch. [1] As the species reaches adulthood, males usually measure a maximum of 100 cm (39 inches), while females typically measure 125 cm (49 inches) long. The species therefore exhibits female-dominant sexual dimorphism.
Its two dorsal fins are preceded by stout spines, and the anal fin is absent. Active and schooling, the black dogfish is an opportunistic predator and scavenger that mainly consumes bony fishes, crustaceans, and cephalopods. It is aplacental viviparous, with females producing litters of four to 40 pups that are sustained to term by a yolk sac.
The viper dogfish or viper shark (Trigonognathus kabeyai) is a rare species of dogfish shark in the family Etmopteridae, and the only extant member of its genus.It has been found in the Pacific Ocean off southern Japan, the Bonin Islands, Pacific Ocean off northern Taitung County and the Northwestern Hawaiian Islands.
The second dorsal spine is practically vertical and is movable, while the third one is bent towards the back of the body. They are well separated from each other and also from the dorsal fin. [6] The pectoral fins are angled, and with the pelvic fins, allow the frogfish to "walk" on the sea bottom and to keep a stable position for ambush. [7]
The caudal fin has asymmetrical lobes, forming a heterocercal tail. The species name acanthias refers to the shark's two spines. These are used defensively. If captured, the shark can arch its back to pierce its captor with spines near the dorsal fins that secrete a mild venom into its predator. [7]
The dorsal fin has 10 spines and 14-15 soft rays while the anal fin contains 3 spines and 8 soft rays. [2] The long perctoral fin extends as far as the anus and contains16-17 rays. [7] This fish attains a maximum total length of 128 cm (50 in), although 60 cm (24 in) is more typical, and the maximum published weight is 28.6 kg (63 lb). [2]
The isopod parasites which commonly infest the mouth and gills of marine fish are unusually large in the Cuban dogfish. Its reproduction is ovoviviparous , with 10 pups in a litter. It is not generally used for food, but taken commercially for the oil and vitamins extracted from its liver.
Sarcopterygii (/ ˌ s ɑːr k ɒ p t ə ˈ r ɪ dʒ i. aɪ /; from Ancient Greek σάρξ (sárx) 'flesh' and πτέρυξ (ptérux) 'wing, fin') — sometimes considered synonymous with Crossopterygii (from Ancient Greek κροσσός (krossós) 'fringe') — is a clade (traditionally a class or subclass) of vertebrate animals which includes a group of bony fish commonly referred to as lobe ...